What Is Prior Authorization? How It Works

Prior authorization is a review your insurer may require before certain care or prescriptions are covered. Learn how it works, plus denials and appeals.

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You visit a doctor, agree on a treatment or prescription, and then hear that your health plan needs to approve it first. That step is called prior authorization. It can feel like a delay, but understanding what it is and what happens at each step makes it less confusing. This guide explains it in plain language, so you know what to expect and where to check the details that apply to you.

What Prior Authorization Is

Prior authorization, sometimes called preauthorization, is a review some health plans use before agreeing that a service, procedure, test, or prescription may be covered. The plan looks at the request before care happens and decides whether it fits its coverage rules.

It is not the same as cost sharing. See what an insurance premium is and what a health insurance deductible is.

Approval does not mean care will be free. Your deductible, copay, or coinsurance may still apply. After care, your paperwork helps you follow what was billed and paid. See understanding your explanation of benefits.

When Prior Authorization May Be Required

Not every service needs prior authorization. Requirements vary widely by plan, and the same service may need approval under one plan and not another. There is no single list that applies to everyone.

In general, plans are more likely to require review for services that are costly or complex, or where the plan wants to confirm coverage criteria are met. That can include some imaging tests, procedures, hospital stays, specialty medications, and therapies or equipment. Routine visits and common lower-cost care are less likely to need approval, but that is not a rule for every plan.

Your own plan is the reliable source. Your plan documents, member handbook, or the plan's list of services requiring authorization will state what needs approval. See how to choose health insurance. If you are unsure, ask before the service is scheduled — your doctor's office or the member services number on your insurance card can help you check.

How the Process Typically Works

While details differ by plan, the general steps are similar in many cases.

First, a provider — often your doctor's office — submits a request describing the service or medication and the clinical information explaining why it is being requested.

Next, the plan reviews the request against its coverage criteria. The plan may ask for more information, or its reviewer may speak with your provider. That back-and-forth is normal and does not by itself mean the request will be denied.

Then the plan issues a decision, and you and your provider are generally notified. How long review takes varies by plan and request type, so check your plan documents for timeframes rather than relying on a general number. If care is urgent, tell your provider and the plan right away and confirm the urgent process in your plan documents.

What an Approval or Denial Letter Means

An approval letter generally means the plan agreed the service may be covered, subject to your plan's terms. Keep it with your records in case a bill is later questioned. Approval is tied to the specific service and details in the request, so a change in the plan of care may require a new review.

A denial letter means the plan did not approve the request as submitted. It does not always mean the end of the road. Denial letters generally explain why — for example, missing information or criteria not shown to be met — and how to ask for reconsideration or file an appeal. Read the letter carefully, note any deadlines it lists, and keep a copy. The deadlines and instructions in your letter and plan documents control your case.

How Appeals Generally Work

Most plans offer a way to appeal a denial. An appeal usually starts with a request for the plan to review its decision again, often with additional information from your provider about why the service is needed.

Act promptly, follow the instructions in your denial letter exactly, and keep records of what you sent and when. Your provider's office may support the appeal with clinical documentation. If an internal appeal is not successful, some situations may offer additional review levels or an external review by an independent party, depending on your plan and coverage type. Your plan documents and denial letter are the authoritative guide to steps and deadlines.

Frequently Asked Questions

What is prior authorization in simple terms?

It is an advance review by your health plan. Before certain services, procedures, tests, or prescriptions may be covered, the plan reviews a request from your provider and decides whether it fits the plan's coverage rules.

Does an approval mean I will pay nothing?

No. Approval generally means the service may be covered under your plan's terms. Your deductible, copay, or coinsurance may still apply. Check your plan documents for how cost sharing works for that service.

Who submits the prior authorization request?

In many cases your doctor's office or another provider submits the request with supporting clinical information. In some situations you may need to follow up yourself, so ask your provider's office who is handling it.

What should I do if my request is denied?

Read the denial letter in full, note the reason and any deadline it lists, and follow the appeal instructions in the letter and your plan documents. Ask your provider's office whether additional information can support an appeal.

How can I find out if a service needs prior authorization?

Check your plan documents or member handbook, review any list of services requiring authorization your plan publishes, ask your provider's office, or call the member services number on your insurance card before the service is scheduled.

Prior authorization is easier when you know the steps: check whether approval is needed, let your provider submit the request, read the decision letter closely, and act promptly if you need to appeal. If you want plain-language help with your coverage options, request a quote and we will walk through them with you.

This content is educational information about insurance concepts and is not tax, legal, or financial advice. Rules, requirements, and deadlines vary by plan; confirm details in your own plan documents or with a qualified professional.